简介:ThispaperpresentsaframeworkforroadnetworkchangedetectioninordertoupdatetheCanadianNationalTopographicDataBase(NTDB).ThemethodologyhasbeendevelopedonthebasisofroadextractionfromIRS-panimages(witha5.8mspatialresolution)byusingawaveletapproach.Thefeaturematchingandconflationtechniquesareusedtoroadchangedetectionandupdating.Elementaryexperimentshaveshowedthattheproposedframeworkcouldbeusedfordevelopinganoperationalroaddatabaseupdatingsystem.
简介:在研究唐山市地质环境状况的基础上,基于GIS技术建立了唐山市区地质数据库,并利用编程语言VB和GIS组件MapObjects开发地质数据管理系统,实现了地质数据的存储、显示、查询、分析及更新维护,为唐山城市规划与工程建设提供可靠的决策支持.
简介:[1]EgenhoferMJ,FranzosaRD.Point-settopologicalspatialrelations.InternationalJournalofGeographicalInformationSystem,1991,5(2):161~174[2]EgenhoferMJ,FrankA.Object-orientedmodellinginGIS:inheritanceandpropagation.In:ProceedingsofAuto-Carto9.USA:Baltimore,1989.588~598[3]KainzW,EgenhoferMJ,GreasleyI.Modellingspatialrelationsandoperationswithpartiallyordersetsandlattices.InternationalJournalofGeographicalInformationSystem,1993,7(3):215~229[4]WorboysMF.AModelforspatio-temporalinformation.In:Proceedingsof5thInternationalSymposiumonSpatialDataHandling.USA:Charleston,1992a.602~611[5]WorboysMF.Object-orientedmodelsofspatio-temporalinformation.In:ProceedingsofGIS/LIS'92,1992b.825~834[6]WorboysMF,HearnshawHM,MaguireDJ.Object-orienteddatamodellingforspatialdatabases.InternationalJournalofGeographicalInformationSystem,1990,4(4)369~383[7]ZhangMW.Temporalgeographicalinformationsystemtechniquesformonitoringlandcoverchange:[MSDissertation].ITC,TheNetherlands,1993.[8]ZhangMW,ShiWZ.Modellingspatial,temporalandattributeaspectsofobjectinGIS.In:ProceedingsofInternationalSymposiumonRemoteSensing.GISandGPSinSustainableDevelopmentandEnvironmentMonitoring.HongKong,1995.583~591[9]ZhangMW,ShiWZ.ImplementationofaConceptualModelforHandlingGeographicalInformation.In:Proceedingsofthe4thInternationalSymposiumofLIESMARS.China,Wuhan,1995.161~169
简介:从地质灾害信息管理现状分析入手,针对目前灾害信息管理的不足,采用信息系统实现的关键技术与方法,并依据科学性、实用性和开放性的原则建立地质灾害信息管理系统及基础数据库,并以MAPTNFO作为后台支持,利用VB语言进行二次开发。该系统具有数据输入、查询、数据统计、图形浏览、信息输出、灾害应急预案处理等功能。
简介:BasedonthenaturalandsocialconditionsaswellashydrogeologicalcharacteristicsoftheRyukyulimestone,amajoraquiferintheRyukyuIslands,aconceptionofundergrounddam,wasproposedintheearly1970sinordertodevelopgroundwaterresourcesintheQuatemaryRyukyulimestoneregionsofJapan.Thepracticeofnearlythirtyyearshasshownthattheundergrounddamisanenvironment-friendlyandeffectivewayfordevelopinggroundwaterintheseregions.``Tofurtherimprovethetechnologyassociatedwithundergrounddam,theauthorsintroducedrelatedanalyticmethods.Theapplicationofthegeographicalinformationsystemtechnologytositeselectionoftheundergrounddamisreportedinthispaper.``
简介:从GIS技术发展的趋势来看,三维GIS是当今GIS领域的前沿技术,它与可视化、虚拟现实的集成已经成为了GIS研究的重要领域。提出了一种基于3dsmax提供的程序开发语言MAXScript在GIS的三雏可视化中开发技术。
简介:本文采用黑龙江省各县的森林覆盖率、森林可燃物载量、林木组成、海拔、防火期月平均气温、相对湿度、风速和降水量8个因子,通过权重和累计概率的方法,应用ARC/INFO技术,并采用矢量图形法中的栅格数据矢量化法,把黑龙江省森林分布图和黑龙江省行政区划图绘成电子地图,然后将其叠加,再转换成大地坐标,从中提取相关数据,最后划分了5个等级的可燃物类型区。全省81个县(林业局)中一、二、三、四和五级森林可燃物类型区分别占全省总数的16%、17%、17%、11%、38%。一级森林可燃物类型区集中在大、小兴安岭、张广才岭、老爷岭等山地林区;五级森林可燃物类型区主要集中分布在松嫩平原、三江平原等地区;其它三种级别的森林可燃物类型区介于平原与山地之间。图2表4参8。